OTTUMWA, IOWA - DECEMBER 21: Guests listen as Democratic presidential candidate former vice president Joe Biden speaks during a campaign stop at the Hotel Ottumwa on December 21, 2019 in Ottumwa, Iowa. The 2020 Iowa Democratic caucuses will take place on February 3, 2020, making it the first nominating contest for the Democratic Party in choosing their presidential candidate to face Donald Trump in the 2020 election. (Photo by Scott Olson/Getty Images)
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Iowa votes differently. See how a caucus works
Wondering how Iowa caucuses work? CNN's Chris Cillizza explains how caucus voting is different from the typical primary vote.
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2020 Iowa Caucuses 4 videos
OTTUMWA, IOWA - DECEMBER 21: Guests listen as Democratic presidential candidate former vice president Joe Biden speaks during a campaign stop at the Hotel Ottumwa on December 21, 2019 in Ottumwa, Iowa. The 2020 Iowa Democratic caucuses will take place on February 3, 2020, making it the first nominating contest for the Democratic Party in choosing their presidential candidate to face Donald Trump in the 2020 election. (Photo by Scott Olson/Getty Images)
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Iowa votes differently. See how a caucus works
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Caucus goers check in before Democratic presidential candidate Sen. Elizabeth Warren, D-Mass., speaks at a caucus at Roosevelt Hight School, Monday, Feb. 3, 2020, in Des Moines, Iowa.
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Entrance poll early results show Biden in the lead
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His vote was up for grabs. Hear how others tried to sway him.
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'Children' in cages appear in Iowa
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